Adjustable spot facer



June 23,1970 H. C.HEUSE R I 3,516,134.

ADJUSTABLE SPOT PACER Filed May 13. 1968 21o F|G.4 l/O F|G.3 Ve 2 5 I8 o 38-. 30 I2 Fqs III

p INVENTOR v 1' l HELMUT C. H US R L. W J V BY f Auw ATTORNEYS United States Patent 3,516,134 ADJUSTABLE SPOT FACER Helmut C. Heuser, Birmingham, Mich., assignor to Bokum Tool Company, Inc., Madison Heights, Mich., a corporation of Michigan Filed May 13, 1968, Ser. No. 728,719 Int. Cl. B26d 1/12; B23b /22, 29/02 U.S. Cl. 29--105 Claims ABSTRACT OF THE DISCLOSURE A spot facer comprising a rotatable holder having a slot at one end adapted to receive a spot facer blade to extend beyond either end of the slot or beyond the end of the holder. The blade is coupled to an adjusting block secured to an internally threaded adjusting spool which is movable by rotation of an adjusting screw. The adjusting block is provided with spaced grooves and the blade carries a pin selectively received in one or the other of said grooves to couple the blade to the adjusting block.

FIELD OF THE INVENTION The invention relates to a spot facer com-prising a rotary holder adapted to carry a spot facing blade projecting beyond one end of the holder and effective to spot face or cut a smooth surface upon rotation of the holder about its axis.

SUMMARY OF THE INVENTION The spot facer comprises generally a cylindrical holder body adapted to be connected to one end of a rotary drive shaft or an extension bar connected thereto. Extending transversely of the body is a cylindrical opening in which an internally threaded adjustable spool is longitudinally slidable. Received in the spool is a screw, rotation of which effects movement of the adjusting spool. The screw carries a dial to provide for micrometer adjustment of the spot facing blade.

Connected to the internally threaded spool is an adjusting block having a pair of spaced grooves. The spot facer blade has a flat shank which is slidable in a guideway extending at one end of the body and the blade is coupled to the adjusting block by a pin which is extended into one or the other of the grooves in the adjusting block.

The shank of the blade is retained in position in the guide slot formed in the body by means of a key, and means are provided engageable with spaced points on the key for tightening it in a slot at the side of the shank of the blade to lock the parts in adjusted position.

It is accordingly an object of the present invention to provide an adjustable spot facer characterized in the provision of means for effecting a wide range of adjustment of the spot facer and yet to provide micrometer adjustment of the blade in any selected zone throughout its range of adjustment.

It is a further object of the present invention to provide a spot facer including threaded adjusting means for effecting adjustment of the spot facer blade transversely of a rotatable holder therefor.

Other objects and features of the invention will become apparent as the description proceeds, especially when taken in conjunction with the accompanying drawing, illustrating a preferred embodiment of the invention.

BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a side elevation of a spot facer with parts in section.

FIG. 2 is an end view of the spot facer looking from the left in FIG. 1.

FIG. 3 is a sectional view on the line 33, FIG. 1.

3,516,134 Patented June 23, 1970 ice FIG. 4 is a sectional view on the line 44, FIG. 2. FIG. 5 is an elevational view similar to FIG. 1 showing the cutting blade in reverse position.

DESCRIPTION OF THE PREFERRED EMBODIMENT The main body 10 of the adjustable spot facer is formed from cylindrical stock and is provided with a relatively large transversely extending recess 12 which extends from one side of the body to a point adjacent to but spaced from the opposite end thereof. Slidable longitudinally in the cylindrical recess 12 is an adjusting spool 14 which is internally threaded as indicated at 16 for threaded engagement with an adjusting screw 18. Fixedly secured to the upper end of the screw 18 is an adjusting dial 20 having graduations provided on its periphery for association with an index mark on the side of the main body 10 for effecting accurate micrometer adjustments of the spool 14. The screw 18 is retained against longitudinal movement by a lock nut 22 which is threaded on a reduced end portion 24 of the screw 18 and bears against a shoulder 26. Similarly, the actuating dial 20 is threaded to the upper end of the screw 18 and bears against an axially facing surface thereon to provide an effective friction lock. As a result of this relationship the screw 18 is retained against axial movement but is permitted to rotate to effect adjustment of the facing tool T.

The body 10 is provided with a transversely extending slot 27 in which the shank 28 of the tool T having a cutting portion 29 is received and is longitudinally slidable. In order to couple the tool to the adjusting spool 14 there is provided an adjusting block 30. The block 30 is movable longitudinally in a slot 32 which affords communication between the recess 12 and the slot 27. The block 30 is connected to the adjusting spool 14 by a screw 34.

The adjusting block 30 is provided with two transversely extending slots 36 and the shank 28 of the tool is coupled to the adjusting block 30 by means of a coupling pin 38 having a threaded head 40 engaged in the shank 28.

In order to provide accurate guiding action for the tool and to provide for clamping it in adjusted position without affecting the accuracy of the adjustment, the shank 28 is provided with a groove 42 which extends longitudinally along one side thereof and is shaped to receive a key 44 which not only guides the tool in its transverse adjustment, but also positively prevents its movement out of the open side of the slot 27 as best seen in FIG. 3. One corner of the key 44 is beveled ofi as for example at 45 degrees as shown in FIG. 3, and the corresponding corner of the groove 42 is similarly beveled. The key 44 is received in a slot 46 formed in the body 10 and intersecting the slot 27. One side of the key 44 is provided with a pair of spaced recesses 48 which receive the ends of set screws 50. The body 10 is also provided with two tapped openings '52 which receive flat-ended set screws 54 which are adapted to engage the side of the key 44 and to position it under predetermined conditions against the bottom of the groove 42.

In use, the set screws 54 are loosened just suificiently to permit the shank 28 of the tool T to be moved longitudinally of the slot 27 This adustment is of course effected by rotation of the screw 18. After the tool T has been adjusted into the desired position the set screws 54 are tightened. This arrangement locks the tool T in adjusted position without disturbing the accuracy of the adjustment which was made by rotation of the micrometer head 20 connected to the screw 18.

Since the adjusting block 30 is provided with a pair of slots 36 adjacent opposite ends thereof, it will be apparent that the tool may be coupled to the adjusting block 30 in two positions spaced apart by the separation of the slots 36. Having coupled the tool T in adjusting block 30 in approximately required position, final adjustment is made by effecting longitudinal adjustment of the spool 14 by rotation of the adjusting head 20, after which screwsfl54 are tightened to lock the tool in adjusted position.

In FIG. 5 the connection of the tool T to the adjusting block 30 with the coupling pin 38 received in the other slot 36, is illustrated.

The drawing and the foregoing specification constitute a description of the improved adjustable spot facer in such full, clear, concise and exact terms as to enable any person skilled in the art to practice the invention, the scope of which is indicated by the appended claims.

What I claim as my invention is:

1. A rotary tool assembly comprising a holder having an axis of rotation, an elongated recess extending transversely of the axis of said holder, an internally threaded adjusting spool movable longitudinally of said recess, an adjusting screw threaded in said spool and carried by said holder for rotation, means acting between said screw and holder preventing axial movement of said screw, a first slot in the end of said holder parallel to said recess, a second slot in said holder connecting said r cess and said first slot, an adjusting block in said second slot, means fixing said block to said spool, a tool having a shank slidable in said first slot, and means coupling said tool shank to said adjusting block.

2. An assembly as defined in claim 1 comprising guiding and locking means in said holder engageable with the shank of said tool.

3. An assembly as defined in claim 2 in which said guiding and locking means comprises a key, and the shank of said tool has an elongated recess in a side thereof extending parallel to the path of movement of said spool a recess in one side thereof, and a locating screw carried by said holder and extending into the recess in said key to prevent removal of said key from said holder when said set screws are loosened.

6. An assembly as defined in claim 2 in which the means coupling said tool to said adjusting block comprises a recess formed in the side of said block facing the shank of said tool, and a drive pin carried by the shank of said tool and extending into the recess in said block.

7. An assembly as defined in claim 6, said drive pin having a threaded connection to said shank which provides for selective withdrawal of said pin from the recess in said block.

8. An assembly as defined in claim 7, said block having a plurality of recesses for selective reception of the end of said drive pin with said tool in different positions relative to said adjusting block.

9. An assembly as defined in claim 5 in which the means coupling said tool to said adjusting block comprises a recess formed in the side of said block facing the shank of said tool, and a drive pin carried by the shank of said tool and extending into the recess in said block.

10. An assembly as defined in claim 9, said block having a plurality of recesses for selective reception of the end of said drive pin with said tool in different positions relative to said adjusting block. 1

References Cited UNITED STATES PATENTS 150,395 5/1874 Chapman 2910 5 X 2,438,607 3/1948 Jackson 279--6 2,559,950 7/1951 Davis 29--97 2,838,316 6/1958 Thomas 2796 3,067,637 12/1962 HOrning 7758 3,069,932 12/1962 Sweeny et al. 77-58 3,144,792 8/1964 Marchis 7758 HARRISON L. HINSON, Primary Examiner US. Cl. X.R. 

